Phylogenetic significance of morphological characters in the tropical Hypotrachyna clade of parmelioid lichens (Parmeliaceae, Ascomycota)

Molecular Phylogenetics and Evolution
Pradeep K DivakarH Thorsten Lumbsch

Abstract

Lichen-forming ascomycetes exhibit often complex morphologies of the vegetative thallus that are usually not found in non-lichenized fungi. This includes the thallus organization and appendical structures associated with the main thallus, such as cilia and rhizines. Such morphological characters are widely employed in the taxonomy of parmelioid lichens, especially at generic level. Within parmelioid lichens, several monophyletic groups can be distinguished, the Hypotrachyna clade being one of them, which includes mostly tropical taxa. In this first molecular study focused specifically on the Hypotrachyna clade, we used maximum parsimony and Bayesian analyses of a combined data set of nuclear ITS and mitochondrial SSU rDNA sequences to (1) test the monophyly of genera presently accepted within the clade and (2) evaluate the phylogenetic value of the morphological characters used to circumscribe genera in parmelioid lichens. Out of the 89 mtSSU and 88 nuITS sequences included in the present study, 121 sequences were newly obtained. Our results show that the taxa within the clade fall into two major groups and that the genus Hypotrachyna is polyphyletic. Everniastrum and Parmelinopsis are nested within Hypotrachyna sensu stricto, ...Continue Reading

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Citations

Sep 24, 2008·BMC Evolutionary Biology·H Thorsten LumbschAna Crespo
May 8, 2009·Micron : the International Research and Review Journal for Microscopy·Suzana Bissacot BarbosaMarcelo Pinto Marcelli
Nov 4, 2008·Micron : the International Research and Review Journal for Microscopy·Suzana Bissacot BarbosaSilvia Rodrigues Machado

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